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  •  A river has a <img alt="\mathrm{BOD}_5 \text { of } 80 \mathrm{mg} / L" src="https://entrancecorner.oncodecogs.com/gif.latex?%5Cmathrm%7BBOD%7D_5%20%5Ctext%20%7B%20of%20%7D%2080%20%5Cmat

 A river has a \mathrm{BOD}_5 \text { of } 80 \mathrm{mg} / L  at a point upstream of a wastewater discharge and a \mathrm{BOD}_5 of 100mg/L  at a point downstream of the discharge. The oxygen demand due to the discharge is ________ kg/day/km.

Option: 1

4.4


Option: 2

5.1


Option: 3

6.2


Option: 4

7.5


Answers (1)

best_answer

The oxygen demand due to the discharge can be calculated using the formula:

oxygen demand =\left(\mathrm{BOD}_5 \text { downstream }-\mathrm{BOD}_5 \text { upstream }\right) \times \text { discharge flow rate/river width }

Assuming a river width of 10 m and a discharge flow rate of  2 \mathrm{~m}^3 / \mathrm{s} we get  \text { Oxygen demand }=(100-80) \times 2 / 10=4 \mathrm{~kg} / \text { day } / \mathrm{km}

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Riya

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